Core-barrel for ingot-molds.



C. G. ROBINSON.

CORE BARREL FOR INGOT MOLDS.

APPLICATION FILED NOV. 9, 19M.

Patented Oct. 19, 1915.

Wimssses:

, unrrnn snares rear T FFlW,

CORE-BARREL FOB, INGOT-MOLDS.

7 Specification of Letters Patent.

Patented Get. f9, 1915.

Application filed November 9, 1914. Serial No. 870,951.

To all whom it may concern 7 Be it known that l, Crrannns G. ROBINSON, a citizen of the United States of America, and resident of Pittsburgh, county of Allegheny, and State of Pennsylvania, have invented certain new and useful Improvements in Core-Barrels for Ingot-Molds, of which the following is a specification.

Jfhis invention relates broadly to core barrels, and specifically to improvements in core barrels employed in casting ingot molds.

The primary object of the invention is to provide an efficient and structurally simplified core barrel for ingot molds which may be readily and completely collapsed and removed from the mold without encountering the difficulties which have heretofore attended such removal. 7

A further object is to provide a core barrel wherein the staves are normally supported in non-engaging positions and are so formed that each may automatically move or collapse inward from the encircling sand core without encountering any hindrance from the others.

With these and other objects in view, the invention resides in the features of construction, arrangement of parts and combinations of elements which will hereinafter be fully described, reference being had to the accompanying drawings, forming a part of this specification, in which- Figure 1 is a top plan view of the inven tion as applied in the casting of an ingot mold; Fig. 2 is a vertical section on the line 22, Fig. 1; Fig. 3 is a horizontal section on line 33, Fig. 2; Fig. 4 is a similar section showing the centralbody member removed and the staves in collapsed position; Fig. 5 is a perspective view .of a stave; and Fig. 6 is a partial vertical sectional view similar to Fig. 2, illustrating a modification.

Referring to said drawings, in which like designating characters distinguish like parts throughout the several views-l indicates generally a central upwardly tapered core arbor, rectangular in cross section, which is preferably of skeleton frame construction, having substantially upright corner members 1 with horizontal connecting members I". Said arbor has an integral base 2 designed for resting upon a pouring seat or base (not shown). Mounted against each of the four sides of the arbor is a stave 3 which is upwardly tapered to correspond with the taper of said arbor and which is substantially uniform in width throughout with the face of the arbor against which it seats. The lower ends of said staves rest upon the base 2, as shown in Fig. 2.

Preferably formed on the innerface of each stave at a point adjacent to its upper end is an integral inwardly directed hook 4 having adownturned end, which is adapted in the normal position of the stave to engage a suitably located loop 5 formed jacent face of the arbor l for interlocking said stave with said arbor against movement except in a longitudinal, or endwise, direction. The interengaging hooks and loops serve to maintain the bodies of the staves in a substantially upright position, as shown in Fig. 2.

Each stave 3 has inturned lateral walls 3 which gradually increase in width from their lower ends upward so that the edges thereof seat throughout their lengths against the ad jacent members 1 of the arbor, preventing access to the arbor openings of the sand of the encircling sand core 6. Said sand core constitutes the core about which the ingot mold 7 is formed, as is well understood, a metal flask or chill 8 of suitable dimensions surrounding said core at a spaced distance therefrom, as shown.

While, as is obvious, the uniformly dimensioned staves, having a width which substantially corresponds throughout with that of the faces of the arbor, as hereinbefore described, will readily fall inward, or collapse, without interference, one with the other, when the arbor has been removed from supporting relation with respect thereto, I prefer to flange the edges of the lateral walls 3 of said staves, as shown at 3 in the drawings, inclining the opposite lateral Walls of each stave inwardly toward each other at substantially an angle of 45 so that said edges sea-t against the arbor members l at points slightly removed from the outer angles of the latter, as is clearly shown in Fig. 3. Thus, when arranged in seated relation to the arbor, adjacent staves are disposed a considerable distance apart, and each stave is consequently permitted, when the arbor is removed, to fall inward a considerable distance before it can possibly engage, or meet resistance from, adjacent staves. With this construction, when the core barrel is collapsed by the removal of the arbor, the staves assume substantially the positions shown in Fig. 4.

on the ad-- In practice,when the metal of the ingot mold 7 has solidified to a suitable extent, and before final contraction of the metal has occurred, the arbor 1 is knocked out, preferably by a heavy blow delivered upon its head, whereupon the staves collapse in the manner above indicated, permitting the mold to shrink without resistance.

Outwardly directed studs or arms 9 may be provided on the members 1 of the arbor, as shown in Fig. 6, said arms being disposed at substantially an angle of 45 to the faces of the arbor and being adapted, when the parts occupy their operative positions, to lie between adjacent staves. hen the arbor v is knocked out, as previously described, said armsserve to break up those portions of the sand core lying between the stave-flanges 8 and which might otherwise slightly interfere with the ready collapse of the staves.

What is claimed is l. A core barrel comprising a tapered arbor having a plurality of faces, a stave disposed against each of said faces, said staves being supported by and interlocked with said arbor and preventing movement of the latter with respect thereto except against endwise movement in one direction only, said staves being normally out of engagement with each other and being adapted, when said arbor is removed, to unobstructedly fall inward.

2. A core barrel comprising a, tapered arbor of skeleton frame form having a plurality of faces, a stave disposed against each of said faces, said staves being unconnected and independently supported by said arbor in positions wherein they are maintained out of contact, and being adapted, when said arbor is removed from supporting position with respect thereto, to unobstructedly collapse inward slightly before contact thereof is permitted.

3. A core barrel comprising a tapered arbor of skeleton frame form having a plurality of faces, a stave disposed against each of said faces, said staves being unconnected and supported by said arbor in positions wherein they are maintained out of contact, and being adapted, when said arbor is removed from supporting position with respect thereto, to collapse inw ard slightly before contact thereof 1s permitted, and means interlocking said arbor w1th said staves exfcept'againstlongitudinal movement in one direction only, said staves approximating in width the faces of the arbor and being adapted unobstructedly to come into contact only after the collapse thereof due to the removal of said arbor from stave-supporting position.

4. In a core barrel, a central tapered arbor of skeleton frame form, and a plurality of unconnected, non-engaging and independently mounted staves disposed against the faces of said arbor, said staves having hookand-eye interlocking connection with said arbor whereby the latter is permitted to be dissociated from said staves by endwise ejection in one direction only, and said staves being adapted to initially collapse before they come into contact.

5. In a core barrel, a central tapered arbor of skeleton frame form, and a plurality of unconnected and independently mounted staves disposed against the faces of said arbor, said arbor being adapted to be dissociated from said staves by endwise ejee tion only, said staves having their arborengaging portions inclined at an angle to and engaging said faces at points removed from the outer angles of the arbor whereby intervening sand-receiving spaces are provided between adjacent staves.

6. In a core barrel, a central tapered arbor of skeleton frame form, and a plurality of unconnected and independently mounted. staves disposed against the faces of said arbor, said arbor being adapted to be dissociated from said staves by endwise ejection only, said staves having lateral inturned walls which seat against said arbor at points removed from the outer angles of the latter whereby open sand-receiving spaces are provided between adjacent staves.

7. In a core barrel, a central tapered arbor, and a plurality of unconnected and independently mounted staves disposed against the faces of said arbor, said arbor being adapted to be dissociated from said staves by endwise ejection only, said staves having lateral inturned walls having flanged edges which seat against said arbor at points removed from the outer angles of the latter whereby open sand-receiving spaces for the reception of sand are afforded between adj acent staves.

8. In a core ba rel, a central tapered arbor, and a plurality of unconnected and independently mounted staves disposed against the faces of said arbor, said arbor being adapted to be dissociated from said staves by endwise ejection only, said staves having lateral inturned walls which are gradually increased in width from their lower ends upward and the edges of which are adapted to seat against said arbor at points removed from the outer angles of the latter whereby open sand-receiving spaces are afforded intermediate adjacent staves.

9. In a core barrel, a central tapered arbor, and a plurality of unconnected and independently mounted staves disposed against the faces of said arbor, said arbor being adapted to be dissociated from said staves by endwise ejection only, said staves having lateral inturned walls, said walls having inwardly inclined flanges adjacent to their edges adapted to seat against said arbor at points removed from the outer angles of the latter, providing open sand-receiving spaces between adjacent staves.

10. In a core barred, a central tapered arbor having a plurality of faces, and a plurality of unconnected and independently mounted staves disposed against said faces, said arbor being adapted for With said staves by endwise ejection only, said staves being supported in positions afdissociation fording open spaces between adjacent staves, 10

and said arbor having arms which project outward therefrom into said spaces.

In testimony whereof, I aflix my signature in presence of two subscribing Witnesses.

CHARLES G. ROBINSON. Witnesses:

H. E. DUNLAP, W. F. KEEFER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, D. C. 

